<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card class="box-card">
      <!-- 警告区域 -->
      <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false" show-icon></el-alert>

      <!-- 选择商品分类区域 -->
      <el-row>
        <el-col>
          <span>选择商品分类：</span>
          <el-cascader v-model="selectedKeys" :options="cateList" :props="cascaderProps" @change="handleCascaderChanged" clearable></el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe style="width: 100%">
            <!-- 展开列 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable @close="handleClose(index,scope.row)">{{item}}</el-tag>
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label='参数名称' prop="attr_name"></el-table-column>
            <el-table-column label='操作'>
              <template v-slot="scope">
                <!-- 修改按钮 -->
                <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row)">编辑</el-button>
                <!-- 删除按钮 -->
                <el-button type="danger" size="mini" icon="el-icon-delete" @click="deleteAttr(scope.row)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe style="width: 100%">
            <!-- 展开列 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable @close="handleClose(index,scope.row)">{{item}}</el-tag>
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label='属性名称' prop="attr_name"></el-table-column>
            <el-table-column label='操作'>
              <template slot-scope="scope">
                <!-- 修改按钮 -->
                <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row)">编辑</el-button>
                <!-- 删除按钮 -->
                <el-button type="danger" size="mini" icon="el-icon-delete" @click="deleteAttr(scope.row)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <!-- 内容区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <!-- 底部区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <!-- 内容区域 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <!-- 底部区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 商品分类列表
      cateList: [],
      // 级联选择框双向绑定到的数组
      selectedKeys: [],
      // 指定级联选择器的配置对象
      cascaderProps: {
        expandTrigger: 'hover',
        checkStrictly: true,
        value: 'cat_id',
        label: 'cat_name'
      },
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入名称', trigger: 'blur' }
        ]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改参数的表单数据对象
      editForm: {
        attr_name: ''
      },
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入名称', trigger: 'blur' }
        ]
      }
    }
  },
  mounted () {
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      // console.log(res)
      // 把数据列表，赋值给 catelist
      this.cateList = res.data
    },
    // 级联选择框选中项变化，会触发这个函数
    handleCascaderChanged () {
      if (this.selectedKeys.length < 3) {
        this.selectedKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      this.getAttrList()
    },
    // 获取参数的列表数据
    async getAttrList () {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      // console.log(res)
      res.data.forEach(t => {
        t.attr_vals = t.attr_vals ? t.attr_vals.split(' ') : []
        t.inputVisible = false
        t.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // tab 页签点击事件的处理函数
    handleClick () {
      // console.log(this.selectedKeys)
      this.getAttrList()
    },
    // 点击按钮，添加参数
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        // 可以发起添加用户的网络请求
        await this.$http.post(`categories/${this.cateId}/attributes`, { attr_name: this.addForm.attr_name, attr_sel: this.activeName })
        this.addDialogVisible = false
        this.$message({
          message: '添加成功',
          type: 'success',
          showClose: true
        })
        this.getAttrList()
      })
    },
    // 监听添加对话框的关闭事件
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
      // console.log(this.$refs)
      // console.log(this.$refs.addFormRef)
      // console.log(this.$refs.addFormRef.resetFields())
    },
    // 点击按钮，展示修改的对话框
    async showEditDialog (row) {
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          params: { attr_sel: this.activeName }
        }
      )

      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }

      this.editForm = res.data

      this.editDialogVisible = true
    },
    // 监听修改对话框的关闭事件
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮，修改参数信息
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        // 可以发起添加用户的网络请求
        await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
        this.editDialogVisible = false
        this.$message({
          message: '修改成功',
          type: 'success',
          showClose: true
        })
        this.getAttrList()
      })
    },
    // 点击按钮,删除对应参数
    deleteAttr (row) {
      this.$confirm('确认删除?', '警告', {
        confirmButtonText: '确认',
        cancelButtonText: '取消',
        type: 'warning',
        callback: async action => {
          if (action === 'confirm') {
            await this.$http.delete(`categories/${this.cateId}/attributes/${row.attr_id}`)
            this.getAttrList()
          }
        }
      })
    },
    // 文本框失去焦点，或摁下了 Enter 都会触发
    handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrTag(row)
    },
    // 提交修改请求的函数
    async saveAttrTag (row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, { attr_name: row.attr_name, attr_sel: row.attr_sel, attr_vals: row.attr_vals.join(' ') })
      if (res.meta.status !== 200) {
        return this.$message.error('修改数据失败')
      }
      this.$message.success('修改数据成功')
    },
    // 点击按钮，展示文本输入框
    showInput (row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(() => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    handleClose (index, row) {
      row.attr_vals.splice(index, 1)
      this.saveAttrTag(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled () {
      return this.selectedKeys.length < 3
    },
    // 当前选中的三级分类的Id
    cateId () {
      if (this.selectedKeys.length === 3) {
        return this.selectedKeys[2]
      } else {
        return null
      }
    },
    titleText () {
      // if (this.activeName === 'many') {
      //   return '动态参数'
      // } else {
      //   return '静态属性'
      // }
      return this.activeName === 'many' ? '动态参数' : '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.el-row {
  margin-top: 15px;
}
.el-tag {
  margin-right: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>
